Soups, Stews & Chili

Quick Creamy Mushroom Soup with Garlic and Parmesan

By Clara ·
November 1, 2026

The mushrooms hiss in the butter, then release a surprising amount of liquid before they start to brown. Let that moisture cook away and the whole pot smells deeper, not watery. That’s the first thing I watch when I make this quick creamy mushroom soup with garlic and Parmesan: the mushrooms need their time before the broth goes in.

After that, the soup comes together without a separate roux or a blender. Onion softens alongside the browned mushrooms, flour thickens the broth right in the pot, and cream and Parmesan go in at the end. I keep the finish gentle so the cheese melts smoothly instead of turning grainy. You’ll get a creamy soup with tender slices of mushroom and a savory Parmesan finish.

Why the Parmesan Goes In After the Soup Thickens

Parmesan can turn grainy when it’s boiled hard, and cream doesn’t need a rolling boil to become hot. This soup handles both by simmering the broth first, before either one is added. The flour has time to thicken the liquid, and the mushrooms and thyme have time to season it; then the cream and cheese melt into that already-built base over low heat.

That order also gives you a useful point to judge the soup. Before the cream goes in, it should look a little thicker than plain broth, but it won’t be as rich or as opaque as the finished bowl. Once the Parmesan melts, the soup gains more body and a savory edge. Keep the heat low for those last few minutes. If the surface starts bubbling vigorously, lower the heat rather than letting the cheese boil.

There’s no need to blend the pot to make it feel creamy. The flour, heavy cream, and finely grated Parmesan provide the body, while the sliced cremini mushrooms stay distinct in every spoonful.

What the Mushrooms, Flour, and Parmesan Each Bring

• Cremini mushrooms — Their earthy flavor gives the soup its center of gravity. Choose firm mushrooms with dry-looking surfaces; thin, even slices cook at a similar pace and are easy to brown. White button mushrooms can work, but the soup will taste a little milder.
• Unsalted butter — It carries the mushroom flavor and lets you control the seasoning separately. Unsalted butter is useful here because broth and Parmesan both contribute salt; there isn’t a direct dairy-free swap in this ingredient set that will keep the same flavor and texture.
• Yellow onion and garlic — The finely diced onion softens into the base rather than leaving large pieces, while minced garlic releases its aroma quickly. Fresh garlic matters more than finely dicing the onion perfectly; mince it small enough to cook through in its brief time in the pot.
• All-purpose flour and dried thyme — Flour gives the broth a light, spoon-coating thickness, and dried thyme holds its herbal character through the simmer. Stir both through the mushrooms before adding broth so the flour is distributed around the ingredients instead of clumping on the liquid.
• Low-sodium chicken or vegetable broth — Either works as the soup’s liquid base. Low-sodium broth leaves room for the Parmesan’s saltiness; choose vegetable broth when you want a vegetarian base, and see the variation below for the cheese detail.
• Heavy cream and finely grated Parmesan — Heavy cream gives the soup its lush texture, and finely grated Parmesan melts more evenly than large shreds. A good-quality Parmesan adds a noticeable savory finish, so grate it finely before you begin cooking.

Build the Soup in the Same Pot, One Layer at a Time

Brown the Cremini Mushrooms

Melt the butter in a 5-quart pot or Dutch oven over medium-high heat, then add the thinly sliced mushrooms, kosher salt, and black pepper. Cook for 8 to 10 minutes, stirring occasionally. The mushrooms will release liquid first; keep cooking until that liquid has cooked off and the slices are browned. If they’re still sitting in a pool of liquid, they aren’t ready for the onion yet.

Soften the Onion Before Adding Garlic

Add the finely diced onion and cook for 3 to 4 minutes, until it softens. Stir in the minced garlic and cook for 30 seconds. The garlic should smell fragrant, not toasted or dark; it can scorch quickly at this stage. Keep it moving with the onion and mushrooms.

Stir in the Flour, Then Add Broth Gradually

Sprinkle the flour and dried thyme over the mushroom mixture and stir for 1 minute. You want the flour worked through the mushrooms rather than sitting in dry patches. Pour in the broth gradually while stirring, taking your time as the liquid meets the flour. Keep stirring as you add it so the soup starts smooth.

Simmer Until the Broth Has Body

Bring the soup to a gentle boil, then reduce the heat to medium-low. Simmer for 8 to 10 minutes, stirring occasionally, until it’s slightly thickened. A spoon dragged through the soup should leave a brief trail rather than revealing a watery broth. Keep the simmer gentle; a hard boil isn’t needed for the flour to do its job.

Finish with Cream and Parmesan Over Low Heat

Stir in the heavy cream and finely grated Parmesan, then cook over low heat for 2 to 3 minutes, until the cheese has melted and the soup is hot. Stir as it warms so the Parmesan distributes through the pot. Don’t let the soup boil after adding the dairy. The finished soup should look creamy, with the mushroom slices still visible.

Two Broth Choices That Change the Bowl

Questions That Come Up When Making Mushroom Soup

Quick Creamy Mushroom Soup with Garlic and Parmesan

Creamy mushroom soup with garlic and Parmesan comes together on the stovetop with browned cremini mushrooms and a gently thickened broth. Heavy cream makes each spoonful silky, while thyme adds a savory finish.

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Prep Time 10 minutes mins

Cook Time 27 minutes mins

Total Time 37 minutes mins

Servings: 4 servings

Course: Lunch

Cuisine: American

Calories: 390

Ingredients Equipment Method Notes

Ingredients

  

• 3 tbsp unsalted butter
• 1 lb cremini mushrooms thinly sliced
• 0.5 tsp kosher salt
• 0.25 tsp black pepper
• 0.5 yellow onion medium, finely diced
• 3 cloves garlic minced
• 2 tbsp all-purpose flour
• 1 tsp dried thyme
• 4 cups chicken or vegetable broth low-sodium
• 1 cup heavy cream
• 0.5 cup Parmesan cheese finely grated

Equipment

• 1 5-quart Dutch oven

Method

 

1. Melt the butter in a 5-quart pot or Dutch oven over medium-high heat.
2. Add the mushrooms, salt, and pepper and cook, stirring occasionally, for 8 to 10 minutes, until the mushrooms have released their liquid and are browned.
3. Add the onion and cook for 3 to 4 minutes, until softened.
4. Stir in the garlic and cook for 30 seconds.
5. Sprinkle the flour and thyme over the mushrooms and stir for 1 minute.
6. Gradually pour in the broth while stirring to prevent lumps.
7. Bring the soup to a gentle boil.
8. Reduce the heat to medium-low and simmer for 8 to 10 minutes, stirring occasionally, until slightly thickened.
9. Stir in the heavy cream and Parmesan.
10. Cook over low heat for 2 to 3 minutes, until the cheese is melted and the soup is hot; do not boil.

Notes

For the deepest flavor, let the mushrooms brown well before adding the onion. Refrigerate leftovers for up to 3–4 days; freezing is not recommended because the cream can separate. Use vegetable broth to keep the soup vegetarian.